Topband: T-loaded vertical

[Edward]

That's good news. I am in Saudi Arabia on a small lot. My plan is to use my ladderline-fed Cobra Ultralite dipole (73' long), tying the 100' ladderline together, making a T.  Will load it against a decent ground via a wide range tuner. 

Thoughts?

Thanks,
Ed 7Z1ES

> On 20 Feb 2020, at 7:45 AM, GEORGE WALLNER <aa7jv at atlanticbb.net> wrote:
> 
> The T has another advantage: it is better on 80 (and 40) if you can match it. A 160 m inverted L, with a substantial length horizontal wire, makes a poor 80 meter radiator because of high angles. A T will give you more low angle radiation.
> 
> 73,
> George,
> AA7JV
> 
> 
>> On Wed, 19 Feb 2020 15:31:21 -0500
>> "Ed Sawyer" <sawyered at earthlink.net> wrote:
>> Rick said it better.  Thanks Rick.  The T has been a great performer for me in 4 different locations over the years.  I swear by it for 55 - 70 ft vertical sections.
>> 
>> Ed  N1UR
>> 
>> -----Original Message-----
>> From: Richard (Rick) Karlquist [mailto:richard at karlquist.com] Sent: Wednesday, February 19, 2020 3:04 PM
>> To: Ed Sawyer; donovanf at starpower.net; topband at contesting.com
>> Subject: Re: Topband: T-loaded vertical
>> 
>> 
>>> On 2/19/2020 11:50 AM, Ed Sawyer wrote:
>>> I have personally found that for Ts that are only 70 ft vertical, like mine, the ground losses of the long topped L are not as desirable as the cancelled out horizontal lobes of the T.  If the T were say 90 ft of vertical, I don’t think the T adds as much value.
>>> Ed  N1UR
>>> 
>>> 
>> When you model an inverted L, the driving point resistance
>> goes up when you lengthen the top.  This it appears that
>> you decreased ground losses and your efficiency goes up.
>> However, if model vertical polarized radiation vs input
>> power, you find that your effective efficiency actually
>> goes down.
>> 
>> Extending the inverted L top out to where you have a 1/4
>> wavelength of wire seems very elegant.  The antenna
>> reaches resonance at 1830 and you get a low VSWR without
>> using a tuner.  If you model that vs a T vertical, there
>> is no comparison. The T wins.
>> 
>> Rick N6RK
>> 
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